<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <h3>{{message}}</h3>
    <!-- 因为v-once关系不会改变 -->
    <h3 v-once>{{message}}</h3>
  </div>
  <script src="../vue.js"></script>
  <script>
    const vue = new Vue({
      el: '#app',
      data: {
        message: "你好呀，李银河"
      }
    })
  </script>
</body>

</html>